98173991 has 4 divisors (see below), whose sum is σ = 99186192. Its totient is φ = 97161792.

The previous prime is 98173939. The next prime is 98174029. The reversal of 98173991 is 19937189.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19937189 = 4337 ⋅4597.

It is a cyclic number.

It is not a de Polignac number, because 98173991 - 2⁶ = 98173927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98173391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505955 + ... + 506148.

It is an arithmetic number, because the mean of its divisors is an integer number (24796548).

Almost surely, 2^98173991 is an apocalyptic number.

98173991 is a deficient number, since it is larger than the sum of its proper divisors (1012201).

98173991 is a wasteful number, since it uses less digits than its factorization.

98173991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012200.

The product of its digits is 122472, while the sum is 47.

The square root of 98173991 is about 9908.2789121017. The cubic root of 98173991 is about 461.3163163340.

The spelling of 98173991 in words is "ninety-eight million, one hundred seventy-three thousand, nine hundred ninety-one".